Incandescent-lamp socket.



E. A. BRETZ.'

INGANDESGENT LAMP SOCKET.

PPLIGATIOH FILED hun.; 1907. BBNBWED Hu. 5, 1909.

Patented 0013.l 26, 1909.

'Y "TMNLW UNITED sTATEs PATENT oEEioE.

' HOMER ALLISON BRETZ. OF CHICAGO. ILLINOIS. ASSIGNOR TO THE FEDERAL ELECTRIC COMPANY. OF CHICAGO, ILLINOIS. A CORPORATION F ILLINOIS.

. INCANDESCENT-LAMP SOCKET.

Speclcation of Letters Patent.

Application filed Harch 4, 1907, Serial No. 360,450). Renewed March 5, 1909. Serial lo. 451,541.

To allo/hom 'it may conccrnf' lc it known that l. lloilizii ALLisnN BiiaTz, a citizen of the United States, residing at- Chicago. iii the, county of (,ookand State of Illinois, have invented :i new and useful Incandescent-l.amp Socket, of which thc following is a specification.

This invention relates to incandescent lamps and more particularly to means for sup orting the lamp in position on a metal Ysur ace or other suitable support.

The'robjeet of'the invention is to provideY an incandescent lamp having an electrom et associated therewith and connected 'in ries with the lighting circuit so that when the current is turned on the magnet will be energized and thus support the lamp in position on a metallic surface without the em loyment of hangers, suspension cords an similar auxiliary supporting devices. l

A further object of the.` invention is to provide means whereby the exciting coil may be readily detached from the shell or casing and further to -provide improved meansv for connecting the terminals of the lighting circuit to the binding screws.

A still further object of the invention is to generally improve this class of devices so as to increase their utility, durability and etliciency. Further objects` and advantages will apar in the following description, it being understood that various changes in the form,

Vproportions and minor detalls of construction maybe resorted to`within the scope of the ap nded claims. In t e accompanying drawings part ofv this specification: Figure 1 is a 1on- 'tudinal sectional View of an incandescent amp socket constructed in accordance with invention. Fig. 2 is a transverse sectional View taken on the line 22 of Fig. 1 and looking in the direction of the arrow. Fig. 3 is a similar view taken on the line 'on of the iu'- lrow. Fig. 4 is abottoin plan view. Fig. 5

is a transverse sectional view taken on the h ne 5--5 of Fig. 1. Fig. G is a perspective viewrof the insulating collar orV sleeve dcforniing aY tac-hed. Fig. 7 is a front elevation of the insulating block showing the manner of attaching the terminals of the electric circuit. Fig. 8 is a diagrammatical view.

Similar numerals of reference indicate corresponding parts iiivall of the figures of the drawings. Y

The device consists of an o tallic casing or shell 5 prefera iii form, as shown and provid crallv extending collar 6 the interior walls of which are threaded for engagement with a plug or bushing 'l'. the latter beinv formed of rubber. gntta-penrlia or other suitabley insulating material.

Housed within the casing 5 is an electromagnet, the core S of which is provided with an annular flauwe 9 which bears against the interior walls ofthe metal casing 5. said core being secured in position on the casing by means of screws or similar fastening devices l() which pierce the walls of the casing and engage the flange, as shownl interposed between the interior walls of the casing and the core 8 is an exciting coil 11. the terminals of which are vconnected in series with the lighting circuit l2 .so that when the current is turned on the electromagnet will be energized and thus support the lamp on a lathe, boiler or other metallic surface. 'llie lowervei'id of (he core is provided with an annular groove 13 in which is seated a retaining ring 14. and interposedbe tween the ring 1+ and the exciting coil 11 is tbe adjacent head 15 of an insulating spool or bobhiii. the o posite head 16 of the bobbin being interposet between the opposite end of )en ended melv cylindrical the coil am the adfaceut face of the flange 9.

Mounted on the flange of the core 8 is au insulating block preferably formed in two sections 1T and 1S detachably secured to getlier and to the flange J by means of screws' Patented out. 2 6, 1909.

with a lat- SAO ' provided wit nected one of the terminals of the exciting coil 11.

Embedded in snit-able recesses Q-l formed in the bottom of the section 18 are spaced contact plates 2f and 2t, cach provided with a binding screw QT for engagement with thc adjacent terminal of the lighting circuitl2. The plate :26 is; provided with :in auxiliary binding screw s t'or vnunet-tion with the adjacent terminal of the exciting coil, said auxiliary binding screw h' being extended upwardly through th'- section 1S so that tne terminal of the exciting coil may be readily vclamped in contar: will.| tht` plate 25.

The upper section :15' is provided with a recess 29 for the reception ol' the conductors -of the lighting circuit, said conductors being crossed and intcrtwisted. as indicated at 30 and connected to the binding screws W thus locking the terminals in contact with the binding screws and prei'enting yaccidental displacement. of the saine in ease a -longitudinal pull is exerted on the conductors. The upper section 1S is also preferably formed with a'segmental recess 31 to accommodate the electrical conductors 12' when the electromagnet. 1s withdrawn from the casing so as to prevent the wire from binding against the interior walls of the latter and thus preventing the withdrawal pf the excitin coi. The conductors 12 are E the usual extension plug 32 so that the lamp may be conveniently connected in an ordinary lighting` circuit.

interposed between the interior walls of the casing 5 and the section 1S is a split collar or sleeve 33 prt-tera bly formed of,\ul canized fiber or other suitable insulating material and having a recess or opening 34 formed therein to accommodate the conditetors 12', there being an insulating rin 35 interposed between thc adjacent end o the easing and a threaded collar 36 of the socket piece, as shown. If desired. however, the insulating ring 35 may he dispensed with and the latter formed integral with t-ltc threaded collar. i [t will' thus be sven that. when the cnrren is turned on the latter will flow through one ol' the conductors l2' to the contact. plate QC and thence through the exciting-coil 11 to the binding .screw 23 and ilu-nec through the lanipypin Iii', and plate :25 through the` opi postte conductor to the lint. as intlil'atcd by thc arrow in lfig. S ol' th-` dran ings. bcn

' tht' lamp is lighted tlul nmgnciit' circuit nl' lines ol' t'ori'twill pass'downwardly through (lncored-hand tnt-tsl biot-i to ulti-'lt tltt` socio-t is attached. and thence upwardly through the casing o and tin' =5| to the t'otc S. as indicated by the. arrows in l-"ig, H ot' the drawings. ntl the magnet will be dciinergizt-d .so that tht` lau-p nar lr rozulily delai-heil from tht` 'metallic surface,

moved without turning otil the current by merely tilting the socket so as to disengage the core of the magnet surface.

While the device is principally desi ned for supporting incandescent lamps on ioilers, lathes and other metal objects in machine shops and similar places, it is obvious that the same muy ne used wherever a device of this class is found desirable.

is claimed is:

1. An incandescent la Inp including a casing. an elcctroniagzict housed within the casing and provided with a`laterally extending Plunge bearing against the interior walls of the casing. fastening devices piercing the walls of the casing and engaging the flange. and an energized circuit. the terminals of which extend through the walls of the casing and In connected in series with the lamp and electromagnet.

2. An incandescent lamp including a cass ing, an electronmgnet provided with a core one end of which is 4tormed with an annular groove and the opposite end thereof provided with a lateinlljv extending flange bearfastening devices piercing the walls of the casing and engaging the Harige, a retaining ring stated in the groove of the core. and an energized circuit connected in series with the lamp and magnet.

3. An incandescent lamp including a cas- 'ing having an opening formed in one wail thereof. an insulating block disposed within vthe casing, a socket piece carried by the block for engagement with the lamp. an electromagnet bearing against the block 'and provided with a core having a retaining groove formed in one enfl thereof, a ring seated in ysaid core, an insulating spool, one end of which is interposed between the ring and the' exciting coil of the magnet, and an energized circuit the terminals of which are connected in series with the lamp and mag net.

4. '.\n incandescent; lamp including an open ended metallic casing: having an opening forming in ont` all thereof, an insulating hlm-lt' disposed within the casing and provided with a chamber` an eleetroimignetbear-ing against. the insulating blot-lt. an enerj rixcd circuit thtl terminals of which are t housed within thc chamber and electrically ,connected with the lamp and magnet. respectively and a split sleeve interposed betm-vn thtwalls ot the casing and insulating tdw-l; :intl having au opt-ning l'ornied therein tot the reception ol' the terminals ofthe cirt'll Il I. .\n tnt-anticsrent lamp including an n ended metallic casing. an insulating -sposwl nithin the casing :and profrom said metal Having thus described the invention what ing against the interior walls of the casing, t

or the lamp may be rellt) 938,038 l i l 8 vided with a chamber having a recess coml from one Wall thereof, an insulating block municating therewith, an electromagnet carl ried b v the easing and bearing against the insulating block, and an energized circuit the terminals of which are extended through the walls of the casing and having its ends intertwisted and seated withir the chamber. said terminals being electrically connected with the lamp and magnet, respectively.

G. An incandescent lamp including an open ended metallic casing, an insulating lock disposed within the easing and provided with an intermediate chamber, spaced bindingv screws disposed within the chamber, ai; electromagnet carried by the casing and an energized circuit the terminals'of which are extended in opposite directions and intercoiled for connectlon with the adjacent bindingr screws, said lamp and magnet being connected inseries with the circuit.

7. An incandescent lamp including:lr an open ended metallic casing having a perforated insulating buiing extending laterally i disposed Within the casing and provided with an intermediate chamber, spaced binding screws disposed Within the chamber, there being an opening formed in the block and communicating with the chamber. an electroinagnet carried b v the casing and housed within the same. an energized circuit the terminals of which are extended in opposite directions and intel-coiled for connection with the binding screws, said terminals being operatively connected with the lamp and magnet.respectively, and a split sleeve interposed between the casing and the block and provided with. an opening` for the reception of the terminals of the. circuit.

Tn testimony that I claim the foregoing as my own, I have hereto aflixed my signature in the presence of two Witnesses.

HOMER ALLISON BRET7.

lVitnesses GEO. A. FULLER', lV. L. TRUESDELL. 

